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71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package anchor
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// IsAnchor is a function handler
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type IsAnchor func(str string) bool
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//IsConditionAnchor checks for condition anchor
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func IsConditionAnchor(str string) bool {
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if len(str) < 2 {
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return false
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}
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return (str[0] == '(' && str[len(str)-1] == ')')
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}
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//IsNegationAnchor checks for negation anchor
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func IsNegationAnchor(str string) bool {
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left := "X("
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right := ")"
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if len(str) < len(left)+len(right) {
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return false
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}
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//TODO: trim spaces ?
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return (str[:len(left)] == left && str[len(str)-len(right):] == right)
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}
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// IsAddingAnchor checks for addition anchor
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func IsAddingAnchor(key string) bool {
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const left = "+("
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const right = ")"
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if len(key) < len(left)+len(right) {
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return false
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}
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return left == key[:len(left)] && right == key[len(key)-len(right):]
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}
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// IsEqualityAnchor checks for equality anchor
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func IsEqualityAnchor(str string) bool {
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left := "=("
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right := ")"
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if len(str) < len(left)+len(right) {
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return false
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}
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//TODO: trim spaces ?
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return (str[:len(left)] == left && str[len(str)-len(right):] == right)
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}
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//IsExistenceAnchor checks for existence anchor
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func IsExistenceAnchor(str string) bool {
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left := "^("
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right := ")"
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if len(str) < len(left)+len(right) {
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return false
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}
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return (str[:len(left)] == left && str[len(str)-len(right):] == right)
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}
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func removeAnchor(key string) string {
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if IsConditionAnchor(key) {
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return key[1 : len(key)-1]
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}
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if IsExistenceAnchor(key) || IsAddingAnchor(key) || IsEqualityAnchor(key) || IsNegationAnchor(key) {
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return key[2 : len(key)-1]
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}
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return key
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}
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